Rail shower



FIG. 1 is an isometric view of a rail shower according to our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The evenly-spaced broken lines in the figures represent portions of the rail shower that form no part of the claimed design. 

CLAIM The ornamental design for a rail shower, as shown and described. 